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Heavy metal lead-arsenic composite contaminated soil remediation agent and preparation method thereof

A soil remediation agent and compound pollution technology, which is applied in the field of heavy metal lead and arsenic compound contaminated soil remediation agent and its preparation, can solve the problems of lack of long-term ecological risk assessment research of materials, damage to soil structure and planting function, complex preparation process, etc., to achieve Ease of large-scale production and popularization, cheap raw materials, and simple preparation methods

Active Publication Date: 2020-03-27
HIGH & NEW TECH RES CENT OF HENAN ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing remediation technologies and materials focus on the remediation of heavy metal pollution in acidic soils, but are not suitable for the current situation of dry and alkaline soils in the north
Most restoration materials use industrial waste, metal oxides, etc. as raw materials, which can easily cause secondary pollution and damage the soil structure and planting function; some new functional materials have complex preparation processes and high costs, and lack of long-term ecological risk assessment for these materials Research

Method used

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  • Heavy metal lead-arsenic composite contaminated soil remediation agent and preparation method thereof
  • Heavy metal lead-arsenic composite contaminated soil remediation agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A remediation agent for heavy metal lead-arsenic composite polluted soil is composed of the following raw materials in parts by weight: 50 parts of modified fruit charcoal, and 50 parts of humic acid modified attapulgite materials.

[0031] The above-mentioned modified fruit charcoal is specifically prepared through the following steps:

[0032] Dry the fruit charcoal at 105°C, grind it, and sieve it through a 100-mesh sieve. 100g of fruit charcoal sieved through a 100 mesh sieve, 100ml of 68% concentrated nitric acid, 300ml of 98% concentrated sulfuric acid were fully mixed, allowed to stand and cooled. Sonicate the cooled solid-liquid mixture at room temperature for 3.5 hours, centrifuge and filter to remove the acid solution in the upper layer, take the solid residue and wash it with deionized water until it is neutral (that is, wash the solid residue repeatedly with deionized water until the washing liquid is neutral. sex). Dry the solid material obtained from the...

Embodiment 2

[0043] A heavy metal lead-arsenic compound polluted soil remediation agent is composed of the following raw materials in parts by weight: 45 parts of modified straw charcoal, and 55 parts of humic acid modified attapulgite material.

[0044] The above-mentioned modified straw charcoal is specifically prepared through the following steps:

[0045] The straw charcoal was dried at 105°C, ground, and sieved through a 100-mesh sieve. 100g of straw charcoal sieved through a 100-mesh sieve, 100ml of 68% concentrated nitric acid, and 300ml of 98% concentrated sulfuric acid were fully mixed, allowed to stand and cooled. Sonicate the cooled solid-liquid mixture at room temperature for 5.0 hours, centrifuge and filter to remove the acid solution in the upper layer, and wash the solid residue with deionized water until it is neutral (that is, repeatedly wash the solid residue with deionized water until the washing liquid is neutral. sex). The solid material obtained by the above washing...

Embodiment 3

[0055] A heavy metal lead-arsenic compound polluted soil remediation agent is composed of the following raw materials in parts by weight: 75 parts of modified straw charcoal, and 25 parts of humic acid modified attapulgite material.

[0056] The above-mentioned modified straw charcoal is specifically prepared through the following steps:

[0057] The straw charcoal was dried at 105°C, ground, and sieved through a 100-mesh sieve. 100g of straw charcoal sieved through a 100-mesh sieve, 100ml of 68% concentrated nitric acid, and 300ml of 98% concentrated sulfuric acid were fully mixed, allowed to stand and cooled. Sonicate the cooled solid-liquid mixture at room temperature for 2.0 hours, centrifuge and filter to remove the acid solution in the upper layer, and wash the solid residue with deionized water until neutral (that is, repeatedly wash the solid residue with deionized water until the washing liquid is neutral. sex). The solid material obtained by the above washing is dr...

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Abstract

The invention discloses a heavy metal lead-arsenic composite contaminated soil remediation agent which is characterized by comprising the following raw materials in percentage by weight: 30-75% of modified carbon material and 25-70% of humic acid modified attapulgite material. The soil remediation agent can efficiently adsorb lead and arsenic in soil without obviously changing soil properties andcultivation conditions . After three months of curing, the remediation agent can reduce the contents of available lead and arsenic in soil by about 40-70%, reduce the contents of arsenic and lead absorbed by sensitive crops by 44-84% and achieve the effect lasting time of more than 3 years. Meanwhile, the material has the characteristics of low cost, simple preparation process, no secondary pollution, quick effect, easiness in large-area popularization and the like and can be widely applied to remediation of agricultural land soil polluted by lead and arsenic.

Description

technical field [0001] The invention belongs to the technical field of remediation of heavy metal polluted soil in environmental protection, and in particular relates to a remediation agent for heavy metal lead and arsenic composite polluted soil, a preparation method and a use method thereof. Background technique [0002] my country's cultivated land soil pollutants exceed the standard rate as high as 19.4%, of which more than 80% are heavy metal pollution. When the heavy metals in the soil exceed a certain level, the soil's self-purification and recovery ability will be lost, and the soil quality will decline, which will not only seriously deteriorate the quality of the ecological environment, but also cause harm to human health through the food chain. [0003] There are two main methods for the remediation of heavy metal pollution in farmland soil; one is to change the existing form of heavy metals in polluted soil, and convert them from an active state to a stable state,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40B09C1/08C09K101/00
CPCC09K17/40B09C1/08B09C2101/00C09K2101/00
Inventor 刘珂珂董学亮王俊伟李中贤刘小培肖进彬郑果刘清余学军
Owner HIGH & NEW TECH RES CENT OF HENAN ACAD OF SCI